Homework Help: chemistry

Posted by Mahir on Thursday, October 29, 2009 at 7:59pm.

1. The bombardier beetle uses an explosive discharge as a defensive measure. The chemical reaction involved is the oxidation of hydroquinone by hydrogen peroxide to produce quinine and water:
C6H4(OH)2 (aq) + H2O2 (aq) �� C6H4O2 (aq) + 2 H2O (l)
Calculate ΔH for this reaction from the following data:
C6H4(OH)2 aq --> C6H4O2 aq + H2 g ΔH = +177.4 kJ
H2 g + O2 g --> H2O2 aq ΔH = -191.2 kJ
H2 g + ½ O2 g --> H2O g ΔH = -241.8 kJ
H2O g --> H2O (L) ΔH = -43.8 kJ

chemistry - DrBob222, Thursday, October 29, 2009 at 9:25pm
Add equation 1 to the reverse of equation 2, then add twice equation 3 and twice equation 4. Cancel atoms/molecules common to both sides and check to make sure you have the equation you want. Don't forget to change the sign of any delta H value for which the equation was reversed. Also, don't forget to multiply the delta H value for any equation multiplied.

Answer this Question

Related Questions

chemistry - Hydrogen peroxide can be produced in the lab by reacting barium ...
chemistry - An explosive whose chemical formula is C3H6N6O6 produces water, ...
Chemistry - Describe the formation of hydrogen bonds in a hydrogen peroxide, ...
Chemistry - How to prepare 100mL of 3% w/w Hydrogen Peroxide from 30% w/w ...
chemistry - Hydrogen peroxide decomposes according to the following ...
chemistry - Question: When a pink aqueous solution of potassium permanganate, ...
chemistry - In the reaction of hydrogen peroxide with iron (II) ion in acidic ...
CHEMISTRY - The following reaction represents the decomposition of hydrogen ...
oxidation - In the reaction of hydrogen peroxide with iron (II) ion in acidic ...
Chemistry - The following reaction represents the decomposition of hydrogen ...

For Further Reading

First Name:
School Subject:
Answer: